Which Statement is Correct Regarding Exception Traffic Processing?

B

Exception traffic refers to the network traffic that is destined to or generated by the Routing Engine (RE) in a Juniper Networks router or switch. The RE is responsible for running the Junos OS and controlling the system's overall operation. Exception traffic is processed differently than regular traffic, as it requires special handling to ensure that the RE can maintain proper control over the system.

Based on the given options, let's see which one is correct regarding exception traffic processing:

A. Exception traffic is only handled by the PFE. This statement is incorrect. Exception traffic is handled by both the Packet Forwarding Engine (PFE) and the RE. The PFE is responsible for forwarding data packets, including exception traffic, whereas the RE is responsible for controlling the system's overall operation.

B. Exception traffic is rate-limited across the internal link to protect the RE. This statement is correct. Exception traffic is rate-limited to protect the RE from being overwhelmed by high-priority exception traffic. This is important because if the RE is unable to process exception traffic in a timely manner, it can cause system instability or even a crash.

C. Exception traffic is not prioritized during times of congestion. This statement is incorrect. Exception traffic is given priority over regular traffic during times of congestion. This is because exception traffic is critical to the proper functioning of the system, and delaying or dropping this traffic can have serious consequences.

D. Exception traffic is forwarded based on forwarding table entries. This statement is incorrect. Exception traffic is not forwarded based on forwarding table entries. Instead, it is processed by the RE or the PFE, depending on the type of exception traffic and its destination.

In conclusion, the correct statement regarding exception traffic processing is that exception traffic is rate-limited across the internal link to protect the RE.